SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '54b6562723e29778d717bc50f6d11f6b51cb422997ad3e92bbfec51e587e40a3' 
  AND token = 'VHvZxA2RnTSYPSY4qaEOM/jpVkqTUayC61jKSTlv9Gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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