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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c8731aafb83556087ff46bbe20b663d9f63d881a48e14761468c8173639e35d' 
  AND token = 'TwCw+u01jS62GFGPvFvYxp+Wr88o0HSFQQcN2RbHDxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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