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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cff9da016f1f904f6c200f8b5ea40c2736de2bddb5a414ff825d25a44601c678' 
  AND token = 'gkFumuwURxi8jiocrTkhyIZF8Un24OjD4e7gDrNFDyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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