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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '73c0cc72bc8a01d3e44fe6795e07d852f0a1693a206c4a1d9df2360d750dffa3' 
  AND token = 'QsLZcQ1I0aczmIYeKOe1aLjIz62vo4knWaHdPD5Tdek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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