SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7efe32f4a58bb13e95c5b02b850666b685757640bd7c8ca1ef85a6679c6de257' 
  AND token = 'h9I3/aR/JHvHjolbTl0iO2Jqi94RVBsY+NngTu0qV6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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