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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d6912f1b39c6ec07d318fca80ed9c8ce94f130809dcf0976001fe4ce8941096' 
  AND token = 'CLkYDWYjDRrSJRWyZrbVrXWE4+sDRf5a+kXQHxh8oyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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