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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '16264fbabb92b9d175654125f8784683001150a6142f4b19b3bfae98e7e6a32b' 
  AND token = '3WWkQM133ZNT8eh4ySceY6X68opNipkiMa1u5bFhkQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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