SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'edbe4f3f48683eb6a794402cc71cb00888377256ef0e1ca1ef913c511ad1a9e4' 
  AND token = 'KFMWpx/ECWpAM2/Bhl0+P8V/3m6YE+dAC9u1LjuBXBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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