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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd8e4247d59ff954e1c34900eecc7b1da55f49213b5f780c3b35d67539cd24d0f' 
  AND token = 'Gb34bSLTtFHv9D6uuLyQlnljFbORmHop6F1n7yP6jss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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