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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5a8b1c764bc7de8c74415f9004b187050f65d71dfd12d76a00b62d6210fec220' 
  AND token = 'a4b1jg/qdU0n6EnvLzqrvrZtMBQcj2Py+1sfjZv99F8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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