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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f7139aab3309a10d4129b2386770ab9d633cb5c1dabef81de44583607c72f0c' 
  AND token = 'ej0G9Fma1EygZvlEKGkt8G3O2N1ZDlhwMuGErMiGBoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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