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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '992b64b99468be54d5633289052337244e2fba317236838fa4ac2ffad51639e8' 
  AND token = 'NxzyauF3SaaIxdWvFXNg1mL7WnEdKSlSaXc7ODP7uCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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