SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '01278686e9d57356595ba9cbec9a606ce21463c4404c3dfffbb3c4475f0a2e75' 
  AND token = 'xRY7B1/+IrYhCPynTMeS/kTjo7qPkWdD5LJvRYEBFIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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