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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0bcc42b0e3a652c455b00405f7865a8b3bb013d7fff65ce3241bdddbb8b672fc' 
  AND token = 'tsHA7ztrQAlXDTcWeYYxONx5Etaqch0pE8nwe9Nr2xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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