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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a3e140df13359944bfc52dabd01f80ecb4a37c476fb6c94bab79339cf3962ab' 
  AND token = 'Ke9PQDNMAMvQEARXRoYICPJUpVJA38Hxby4GP1PkB/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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