SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '62a3b608b985fcf4b2b5f17434e216d004abdb6d46fda5845c45441f7f72f760' 
  AND token = 'v2X9rB5v3JS7fNozuMeFsmZ6JSMzx9S0/eLYfz2Vh9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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