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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '39ee4a0ce6a74241e7d1b775950f4aeeac97e690531cf4d4415f7524e2842625' 
  AND token = 'RMnFK+Pyrr9dodmuugRaGCAoDH5Oiui/T4+OJgtB2Rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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