SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8bc6134f4465be85040b2a0cc60647402ee3af53520f79416d568f59fa0d97d6' 
  AND token = 'fYeDpxCx4F+h0Hyt1/j5sA6OE822UtJe4QwvhYXSQGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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