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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8cea7a6f769475d75c48e2afb0d0dcec22f1eccc4d61de0475aff9ac5bf87dcc' 
  AND token = 'KIeMUdPcvqkaPGWX9okIoPFrQ+Tzgd+ZOIfiv0IignY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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