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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4829488eef3673161b8c880968eeb8676a39ee9da65c44be1e68222d5bc124b5' 
  AND token = 'eAoRUuBhdw7E6aY4rspExW4IrULJg5qL8n9tobDdl9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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