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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca536b29cce0750ae94b01d60fda96ab5fe1ba98256e4db004f540b44f5238d0' 
  AND token = 'PoQoMaRA1i6T4n88Y5mWAki5de0H73Zg6F5lOm9NGmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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