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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '079641f587d9f0ecfde4d2f4d4285385c96f0b3be41438b76aa235304dfb2d30' 
  AND token = 'ArMbnSlo5LwRlRSSZoZk5TVqgwN941KagB30lDyXeJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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