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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1277a86f53b87368625cccb61b6116a37325e8e0061eedecc2e5cfef0e7bba8e' 
  AND token = 'bdnSYJxnFH4oeG2MO5Wg6qUNxYxFsV7YQCDQyPgYnXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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