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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4d3a1003539673778548199a1df2113b9e318c6d0e34cb76391cafd4caef4064' 
  AND token = '92wr7WM9QO3IUc/zb92YYvw5wRsnsbTUCOoArpYyFRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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