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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ec6bea34583b963c16e322b3a3969be975fb1d99523981e6dc8aee73f862e8c' 
  AND token = '1ZqKIOLDl7RBCaYol63lXWv4Ays6TF/t2M/iAL3uXDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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