SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e20c9100ba1f2797894f9fdf8c27ceaf71d49a06e554c7861f91c8690bbdb69' 
  AND token = 'wLvPYw+YlRtyclKBEYZH1o3CV9pPRcYgNxFDC46gcw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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