SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a039e47711edc92d1e14e7b5950f051a28fdc8f34a2830d5fd35f823a6f59fe9' 
  AND token = 'w4+zo5/+yUm6pDX7Y388qCpj7UJMR9ybtwfjDKm7N6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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