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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de2f933ac3d0925d1624afcd4757438f1fbaf63f7bcb74abe77996e40d0bb77a' 
  AND token = 'i873PJEFmv3PgKZyfmLvlf9naXEzcqg4/7rmmgFoE8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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