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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd09a6631e737e353b2ce5c0db8fb9c2c6af9efa500d175722ab11fe2f05a2aaf' 
  AND token = 'ERjWHkfuUg9X2k6zKKpYJwBZU7yiXGkyVAWdekCDLdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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