SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b45bc68a058e7631bfe7b8de1edd9cdc4c4176de312e6b3c0533796c09f616a' 
  AND token = 'V+m6/6KR4zHdbk2Eq/GS0aZ32XjmW+zyl2Q3vF04BoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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