SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc735e3c5059592b73edfdb27364454b839bc84602c75b88d98ef94ceea5dc21' 
  AND token = '/slkDTkJqmOtPWJD38eH992xqPIFFhvbYV3rzz02njU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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