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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '51b9039583e27833a8e95cd92185efca46a60908076224f4c1704bc995aea2e1' 
  AND token = 'gpDFifhKvo3fy/pGS8kgoXPeel7cd7VscRI/kWBpeIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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