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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3cec432066d3c6201bd1b1dc002c8342de20298eb8268e42efff4e89ae60d9e' 
  AND token = 'ztqyNWylkb1yADDXjC47vXaqDTh8CkIv/yFu3vZTIpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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