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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b02ed4250646e037e13b4976f41608bd1032141a8483de782eb4babdee02fbb' 
  AND token = '3k2drl/FXNaTaPDTIt1j4CNDiHgSYdKXNI5dTcan97s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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