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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e1be5a375c7d005a4e6fd3c79bc0bc56791b6901296429af0231a8fc268dc27' 
  AND token = 'T0VRbi1mEN5aeM6UK3Db/p0nWW/J/k/rNRlV0vd6zII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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