SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7dbdb104ed43b97ca16e39d98cc70b3e6fd8a7ac2557da1a9c1759c46b3b882f' 
  AND token = 'WwD4XeMxG+1xpocusnJK5n4GAD+ZZujqP0C4CVi2bXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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