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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bdca774495e57dabffc60d79b185b154c88b19f20bc081c82e1edfa46715df97' 
  AND token = 'UG7XyEkx+xdHWCqBeAbaX4Jswldpev8DwdT2R6G0n5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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