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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b439d224ae439bd798e18ad5608a6c0e059512ac572472972825b49ad3979231' 
  AND token = 'mp8pF68f3WbK6foapZla0CddmGVtDmawp69mdsRcseM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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