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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '805c57d60358e85a5be83078fd6d044cc9bdb9f7993b0b68fbc49b99a46f8f09' 
  AND token = '8mXNiWbCiyKTc4mitdkSZiaxiMtZe/jf8iMUpM8pHhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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