SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6d47dd93b2e558adc46f59db85e8ce5d35cbf8584ff6f69e707998703de797b' 
  AND token = 'xnZbL+XdEmgfmjIHIKkTKD/Vav/D4P+KehsxNP2QwtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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