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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'acb48d98a0166bfb688b008aac67be76bbc4dc2e38eaa9bf5e2c7d16e3a94092' 
  AND token = 'jaVrAkxZEFn0WZkEYZIAkiYEtnkEuAp1iIvZ5QD3w8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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