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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '10c7f1bb5f3da081eff73dc9f2b1329252f3d7d9f3505d8dbc11f9f71219e113' 
  AND token = 'CtKlhYblZagsmoxKWrt2T4Vc/FtinMUEQJi6YCfFHDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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