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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d816aff19109b8e8b2515f397ea131f59381f54fc06762796bed052e86c5fc3' 
  AND token = 'nMVjZsma8xaqqNde6yd6YovjNtaevilYzNUZ5DBdncg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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