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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7fb5b9947ef42c06e8aa52e0ce7801c946530c69efe3a1e91f4efaf20e788939' 
  AND token = '2LfWYtZmQ/Ns3ALW2pGQYNzL0sv65F7BUuSRtk0UtIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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