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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '24b38cf6dc9ce6eb41b6122c71ca5f698306e7fdd84ac732716e54e0cb62ea4d' 
  AND token = '6pa0QlvFit6g64e7yaA/FelYjrWbAUuLZ/ZtVrlq8OE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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