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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3db02ca3d2551a3434f87e0da9e4e679af0e113e5aeb0efba0b491732a78f47d' 
  AND token = 'S4fs54CnjlqAQediIjcUHp3x4x4egRjdkyqfo0i0Hvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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