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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '89bfb111d63b3e7375e483677889c3a7aaf8e4009ef032d87f7696df11116ff5' 
  AND token = 'yyfLNKFg0MEl3MwX9HavexNOujhvAMXfug0m3D4uzZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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