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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a119497e78f4214f101bdf57d6ca8bde1ad5a4625c98ed2dfbbceca61cc9f2d8' 
  AND token = 'Gu4aaP+4h2ChcnCv1F1znmlrXyIXecGQBMQisA7ys00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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