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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'adda563a4e18be060c4124816b03af3ec683b1c3d9d772ecaee717d44f0dd369' 
  AND token = 'C0rgb9FhuUvMaVOxVm/1kqdUt2b7MSzPMKTT5Nh5c/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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