SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4d7b9364b560da96f89f2d1157674d5380987cdf9e111288008ac92fe7a27269' 
  AND token = 'vs0T/H4DIU2Mwl+CKBtGqXCzJ+X4IBNWgM7/7C9JPO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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