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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9655187e49aec1cc13a8b1325845ee54c6473262113c250a9fe7009b274916b9' 
  AND token = 'KtOmKWgTlbNMf10KZ1MyEfMXJpbIXnD7LCh+zpjsTWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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