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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '27472526a420a8a2a92f5461a96a34702f3cf3e4c9e967281de9dc34da453a8c' 
  AND token = '9CiHfIGP4IDyNwtRThQAb9lwWrOD165uNOLPEQpj9zA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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