SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c2d7159bdd57c2087de118a28013de487aeaafcfe3fe36bf4e52083a4c69cbe' 
  AND token = 'S6oK9woUOgAuB5+P6KZ6xvZCQp0j+XsvqvrXSFzRDJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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