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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '133af0342651ebec7e1a6eb23a9ff3c086754bfd6052ea8dc68eeec75b4d8b47' 
  AND token = 'zMHoQ/tKnHI4UzC+eW94EsDPyfovbglrUDWw6KADXZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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