SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b2be9d68b1dc2eb9956abb3a15410e7cc00dc0f9f265e11ef2c1ebab07ae0f6' 
  AND token = 'ptv0OgZGJge3wuf4ZIU98BxjCF/OXxm/fdlC7h0tYBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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