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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd0da39d8f06ff8e328c51d8883fcca305009e312a53ad69663491117b72ca3a' 
  AND token = 's7PX4fo230bBLuWwLx9ajrZ6ctarLjXjCt0WQGWNneg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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