SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0429d87266fc34ec64d1248006137f8fbd080b7bd95698fd263afd4406f06dd6' 
  AND token = 'bvhiSBU9gOCgJ2yzPdM2ZkZMx9/qYu/CgdCA2LLiaJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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