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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '839e996c047c9f738e7137962582fc6d41a721320b6177afb0754cc805ae272d' 
  AND token = 'oHeR6uLHHJ5HNJV0ViWHwc91wxPb9Ho1viRDWhAHLfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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