SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0af1e8045e66a003ae72949643d78922fc674973778671fdc498657511a1cfd' 
  AND token = '/Sd+Ndb3oUKQSwGFqPiBprVASGs9n3sPmK+fbwON0RY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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