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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd284d4ae7bb98bbc43e6a2bc0de061d8636bbd3209a4e893b3787746ad6ccf5a' 
  AND token = 'gGUANgWBw/zP7uBH6xos8iBPYyDxGmeTWUE84wSBgck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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