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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66927aef590573108320d2689f998458bd0b367ac4e865cf8662bd0029674f24' 
  AND token = 'sdRFH9oau6NfW4N5p6JzIOrKo1eD63FRVNwATVqVW1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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