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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c2b12151362f07f12dd63ecc50f9be0712eb6fb78a64c738901c7a9a552785f' 
  AND token = '5Sv7eaNysg9UrdW/7yEBYu6uw4+g/+Du5LuM4pXSuAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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