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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '07d1e3e3570064a019cefe29c7cb0b75fc1e69b92e10f8a9ecd071469a244e80' 
  AND token = 'MISR+L5T8ocRVdR0zJCXKy4JWRto9uiQiqQul4QyJFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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