SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e5fb36d217993c3b85a7a7f5e937eea3a50a1724f74bcdc8b1285320eb65f114' 
  AND token = 'MbVOAc6GNTFNTlYC2ok89L+OfjiWzUHs4dDhbUtJq8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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