SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca8bb265aad0e8062e7e046e038ebc2e5959db3c8121cce420a3480d4632126d' 
  AND token = 'ZHIfKcKjZsUO1hcitu/KYpJb8YlzxqjCXJwvlTakj2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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