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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db7ce3871a38cc7e17c81e166d75facd932a96f9e0bb6716d3a7f0032be5b8e8' 
  AND token = 'rAOA/qp5uQRRtyODtL/QrFrt3bkbn5UVvvc+hthf1uA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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