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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93f546017a77804893d3a0295733a796d81d6e3dbefd3dc573523c55baeb2230' 
  AND token = 'UXM5GV68Pmw5HOjxeEJPvKVvN0JvWEaJ2XMrEkGrFH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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