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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96f6369ed76795e3a1c1669fb2cd74ccc08ccd5146b63fd7687d45175776eea7' 
  AND token = 'uuTcWG/Bhts3LGzwQQHGD38ZuafthFouiH43OSRMUuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}