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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '68a1e69d2efa48e6df3e392c96a10b77d680aca06187dda01e9b8252cf823460' 
  AND token = 'impLrDJyzfe4FHFRLo1BRnSebB9klJ+HEjVIn0GQVIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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